MeasureIt
Introduction
The MeasureIt add-on brings CAD functionality to the 3D viewport. It creates dynamic, non-destructive measurements on 3D models and scenes: distances, angles, arcs, and areas that update in real time as you move the mesh.
Use it for:
- Architectural Projects: floor plans and blueprints with precise dimensions.
- Technical Design: components meeting specific size and tolerance requirements.
- 3D Printing: verifying object dimensions before production.
It serves investigators who need dimensioned, documented measurements of models and scenes, and who want those measurements to render into reports.
Key Takeaways
Distance
Measure the exact distance between vertices, edges, or objects in the scene.
Angles & Areas
Calculate and display angles between edges or the surface area of faces.
Render Output
Render the measurement overlays to an image for documentation purposes.
Installation
MeasureIt ships with Blender through version 4.2:
- Go to Edit > Preferences > Add-ons. Find MeasureIt and enable it.
From Blender 5.0 it is an extension with limited support:
- Go to Edit > Preferences > Extensions.
- Search for MeasureIt in the Extensions platform and install it.
The tool is in the 3D viewport sidebar (press N) under the View tab. Click Show in the Measure Tools panel to display existing measurements (this resets each new file).
Blender 5.x also ships a native Measure tool in the 3D viewport toolbar. It measures by dragging in the viewport. MeasureIt adds the labeling and render output features.
Usage
Most measuring tools require Edit Mode (Tab) with the mesh selected.
Create a measurement· edit mode
Select the required vertices/edges/faces (per the feature table below) and create the measurement: a segment, angle, area, or label.
Configure it· item options
Use the Items list to customize each measurement: add text labels, change color, adjust precision, or group segments for cumulative totals.
Render for documentation· render
Use the render section to capture the scene with measurement lines and numbers, producing dimensioned blueprints or technical drawings from the viewport.
Measurement Reference
Edit Mode tools (select vertices in Edit Mode):
| Tool | Setup | Result |
|---|---|---|
| Segment | Select two vertices | Length of the line segment between them (dynamic) |
| Angle | Select three vertices | Angle formed by the three vertices |
| Arc | Select three vertices | Arc data defined by the three points (full-circle option) |
| Area | Face Mode + select faces | Surface area of the selected faces |
| Label | Select one vertex | Custom text label at that point |
| X / Y / Z | Select one vertex | Measurement from the vertex to the object origin along that axis |
Object Mode tools (select objects):
| Tool | Setup | Result |
|---|---|---|
| Link | Select two objects | Distance between them (origins or selected vertices) |
| Origin | Select one or more objects | Distance from scene origin to object origin |
| Annotation | Select the button | Free-floating text label (stored as an Empty) |
Configuration (global settings in the Configuration menu):
| Setting | Location | Result |
|---|---|---|
| Labeling | Item Options | Custom text on any measurement |
| Color Control | Item Options / Configuration | Per-measurement or default color |
| Units & Precision | Configuration | Display units and decimal places |
| Override All | Measure Tools | Forces all measurements to the current settings |
| Sum Feature | Measure Tools | Group (A–Z) segments; displays total cumulative length | | Scale | Configuration | Globally scales all measurement values by a ratio |
In an Investigation
What to document when using MeasureIt
In Your Method Section
- The scene's scale: the units and the reference dimensions used to calibrate the model (e.g. a doorway measured on site at 0.9 m).
- Which measurements were taken with MeasureIt, and which evidence items (photo, model, report figure) they feed.
- The render output settings: resolution and format of the dimensioned captures.
In Your Decision Log
- Why a given pair of points defines the distance in question (e.g. baseboard to ceiling at the location measured).
- Any measurements you did not take, and why: occlusion, uncertain geometry.
- Where MeasureIt values differ from field measurements, and which you trusted.
Verification
Cross-check at least three MeasureIt values against known field measurements (door frames, window sills, standard fixtures) and record the discrepancy. Re-render the dimensioned captures after any geometry change so report figures always match the final model.
Example Methodology Statement
"Distances in the reconstructed scene were measured with the MeasureIt extension (scale calibrated to the site-measured door frame). Dimensioned viewport captures were rendered at 1920×1080 for the report figures. Three spot checks against field measurements agreed within 5 cm."
Limitations
- Measurements must be re-shown (click Show) each time you open the file.
- Bundled with Blender through 4.2. On 5.0+ it is an extension with limited support (see Installation).
- Use in Edit Mode for most tools; Object Mode tools are limited to link/origin/annotation.
- For forensic measurement with source-reliability and uncertainty, pair with the Measurements technique.
Resources
- Measurements, Scale & Dimension, the measurement technique this addon supports
- Precision Modeling, the related precision workflow